package com.gxuwz.medical.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.gxuwz.medical.config.Constant;

/**
 * 
 * @author 演示
 * 
 */
public class AuthorFilter implements Filter {

	public void destroy() {
	}

	public void init(FilterConfig config) throws ServletException {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse resp = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		String id = (String) session.getAttribute(Constant.IDENTIFIER);
		if (id == null) {
			resp.sendRedirect(req.getContextPath() + "/session.jsp");
		} else {
			chain.doFilter(req, resp);
		}
	}

}
